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382. Linked List Random Node DescriptionSubmissionsSolutions Total Accepted: 23716Total Submissions: 51037Difficulty: MediumContributor: LeetCode Given a singly linked list, return a

48. Min Cost Climbing Stairs  On a staircase, the i-th step has some non-negative cost cost[i] assigned (0 indexed). Once you pay the cost, you can either climb one or two steps. You need to find

62. Unique Paths A robot is located at the top-left corner of a m x n grid (marked 'Start' in the diagram below). The robot can only move either down or right at any point in time. The robot i

55. Jump Game Given an array of non-negative integers, you are initially positioned at the first index of the array. Each element in the array represents your maximum jump length at that positio

91. Decode Ways A message containing letters from A-Z is being encoded to numbers using the following mapping: 'A' -> 1 'B' -> 2 ... 'Z' -> 26 Given an encoded message containing digits, det

49. Group Anagrams Given an array of strings, group anagrams together. For example, given: ["eat", "tea", "tan", "ate", "nat", "bat"], Return: [ ["ate", "eat","tea"], ["nat","tan"], ["

48. Rotate Image You are given an n x n 2D matrix representing an image. Rotate the image by 90 degrees (clockwise). Note: You have to rotate the image in-place, which means you have to modify t

46. Permutations DescriptionHintsSubmissionsDiscussSolution Given a collection of distinct numbers, return all possible permutations. For example, [1,2,3] have

15. 3Sum Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0? Find all unique triplets in the array which gives the sum of zero. Note: The solution set must

29. Divide Two Integers Divide two integers without using multiplication, division and mod operator. If it is overflow, return MAX_INT.  题目链接：https://leetcode.com/problems/divide-two-inte

3. Longest Substring Without Repeating Characters Given a string, find the length of the longest substring without repeating characters. Examples: Given "abcabcbb", the answer is "abc", which

39. Combination Sum  Given a set of candidate numbers (C) (without duplicates) and a target number (T), find all unique combinations in C where the candidate numbers sums to T. The same repeat

650. 2 Keys Keyboard Initially on a notepad only one character 'A' is present. You can perform two operations on this notepad for each step: Copy All: You can copy all the characters present on

542. 01 Matrix Given a matrix consists of 0 and 1, find the distance of the nearest 0 for each cell. The distance between two adjacent cells is 1. Example 1:  Input: 0 0 0 0 1 0 0 0 0 Out

Generate Parentheses Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses.For example, given n = 3, a solution set is:[ “((()))”, “(()())”, “(

102. Binary Tree Level Order Traversal DescriptionSubmissionsSolutions Total Accepted: 160620Total Submissions: 420955Difficulty: MediumContributor: LeetCode Given a binary tree,

74. Search a 2D Matrix Write an efficient algorithm that searches for a value in an m x n matrix. This matrix has the following properties: Integers in each row are sorted from left to rig